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Physics / University Physics 13 / Chapter 16 / Problem 74P

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

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BIO Ultrasound in Medicine. A 2.00-MHz sound wave travels

Chapter 16, Problem 74P

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QUESTION:

BIO Ultrasound in Medicine. ?A 2.00-MHz sound wave travels through a pregnant woman’s abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward the sound receiver as the heart beats. The reflected sound is then mixed with the transmitted sound, and 72 beats per second are detected. The speed of sound in body tissue is 1500 m/s. Calculate the speed of the fetal heart wall at the instant this measurement is made.

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QUESTION:

BIO Ultrasound in Medicine. ?A 2.00-MHz sound wave travels through a pregnant woman’s abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward the sound receiver as the heart beats. The reflected sound is then mixed with the transmitted sound, and 72 beats per second are detected. The speed of sound in body tissue is 1500 m/s. Calculate the speed of the fetal heart wall at the instant this measurement is made.

ANSWER:

Solution 74P If v is the magnitude of the heart wall speed,V is a speed of sound and f h is the frequency the heart receives (and reflects),f is ori0inal frequency and f is reflecte back. Consider here heart is moving observer and device is stationary source. f = [(V + v)/v]f h 0 In Second part Hea

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